@article{DBLP:journals/ai/LenatF91,
  author    = {Douglas B. Lenat and
               Edward A. Feigenbaum},
  title     = {On the Thresholds of Knowledge},
  journal   = {Artif. Intell.},
  volume    = {47},
  number    = {1-3},
  year      = {1991},
  pages     = {185-250},
  ee        = {http://dx.doi.org/10.1016/0004-3702(91)90055-O},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}